Closure for cylindrical filter cases



Dec. 13, 1949 C. w. SIMONSEN cLosuRE FOR CYLINDRICAL FILTER cAsEs Filed May 21 1947 INVENTOR. CHARLES W. SIMONSEN ATTORNEY Patented Dec. 13, 1949 UNITED STATES PATENT CFFICE CLOSURE FOR CYLINDRICAL FILTER CASES Charles W. Simonsen, Denver, Colo.

Application May 21, 1947, Serial No. 749,610

1 claim. 1

This invention relates to closure means for a filter case or the like, where space is limited and where tightness automatically available upon assembly is imperative.

The objects are high eiiiciency, low cost, ease of assembly and opening up and long life of parts. It is especially useful when used with a top window here shown but not claimed, but which is claimed in my earlier co-pending application for Windowed lter case, Serial No. 648,312, filed February 18, 1946, of which this application is a continuation-impart.

A drawing accompanies and forms a part hereof in which:

Fig. 1 is an elevation of a complete lter case partly sectioned to show a lter cartridge;

Fig. 2 is a top view of Fig. 1;

Fig. 3 is a blow-out group with a centerline illustrating the order with which they are assembled in the top of the case, and;

Fig. 4 is a section of the case without the closure elements.

Further describing the drawing. Numeral I indicates a cylindrical case, 2 is a bottom, shown welded on 3 is a supply pipe for forcing oil through a filter cartridge 4, from the outside inwardly towards the perforated pipe 5, from whence it returns to a crank case by gravity.

The perforated pipe 5 lends stability to the lter cartridge 4 by being screwed into a socket i on the inside of the bottom 2, and is plugged at the top by a plug 'I. The cartridge 4 serves the additional purpose of a base support for the cornpression spring 8 which bears resiliently against the underside of the top closure plate 9 which contains a window I0.

The case I is equipped with an annular ring I I, welded on. The open end of the ring II is inturned at I2 to about the same diameter as the inside of the case I and the ring I I is only partly pushed over the end of the case I leaving a groove I3, which serves as a seat for the snap-ring I4 which is open at I5. The snap-ring I4 normally enters the groove I3 to lock the annular plate I6 against blowing out. The annular plate I6 serves as a backing plate for the cup-washer II, which has a central opening I8 to receive the -window IIl of the top closure plate 9. The cupwasher I'I will be made of synthetic oil resisting rubber and seals the case I by its lip II8 in the well known manner.

'It is to be observed that the snap ring is of flattened rectangular cross section. its outside diameter is such that it bottoms in the groove I3 when assembled in the case I and its inside diameter is materially less than the outside diameter of the 2 annular plate I6, hence when the parts are assembled the snap ring is in single shear, to resist pressure within the case I, which makes a very strong combination to hold internal pressure and one that is easily assembled and separated.

To assemble the spring 8 is rested on a fresh cartridge 4, the spring 8 is seated thereon, the top closure plate placed on the small end of the spring, the cup washer on top of the cover plate, the annular plate I6 follows providing a seal plate for the cup washer, then some tool or merely the fingers pass through the snap-ring I4 to compress the assembly of parts shown in order in Fig. 3 onto the spring 8 enough so that the snapring I4 can be neatly compressed and placed within the groove I3 whereupon the lter case is sealed in operable condition. It can easily be opened by reversing the order of assembly. Since the presence of a iilter cartridge such as 4 is a prerequisite to assembly it cannot be sealed without it.

This closure device is believed to have substantial advantages over any of the many previously proposed closure structures to satisfy the stated objects of the invention.

Having fully disclosed my invention so that those familiar with the relatively simple art involved can make and use it, what I claim as new and desire to secure by Letters Patent is:

A closure for the open end of a cylindrical lter case or the like, having an inner circumferential groove near its open end comprising a plate like circular closure member that slips easily into the open end of the said filter case, a spring for resiliently urging said closure member outwardly, a rubber cup washer tted over said closure plate, a seal plate that holds the cup-washer in sealing relation to the case and snap-ring means for locking the seal plate against being pushed out characterized by the said snap ring being of flattened rectangular section with an outside diameter that bottoms it in the said circumferential groove, and an inside diameter that is substantially less than that of the said seal plate.

CHARLES W. SIMONSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 848,493 Redenbaugh Mar. 26, 1907 2,072,393 Briggs Mar. 2, 1937 2,089,609 Houghton Aug. 10, 1937 2,215,537 Bjong Sept. 24, 1940 

